From Sahih Muslim (Hadith 6710):
Anas b. Malik reported that a desert Arab said to Allah's Messenger (ﷺ):When would be the Last Hour? Allah's Messenger (ﷺ) said: What preparation have you made for that? Thereupon he said: The love of Allah and of His Messenger (that is my preparation for the Last Hour) (for the Day of Resurrection). Thereupon he (the Holy Prophet) said: You would be along with one whom you love
Reference: Muslim 6710